Function sem_error 

pub fn sem_error(ls: &mut LexState, msg: &[u8]) -> LuaError

Report a semantic error at the current line WITHOUT the near <token> suffix.

Mirrors upstream luaK_semerror (lcode.c), which sets ls->t.token = 0 before calling luaX_syntaxerror so the near clause is suppressed. Used for attribute errors (unknown attribute '<name>', global variables cannot be to-be-closed) where the offending construct is the attribute itself, not the current lookahead token.